Sella Turcica Area and Location of Point Sella in Cephalograms Acquired with Simulated Patient Head Movements

TY - JOUR

T1 - Sella Turcica Area and Location of Point Sella in Cephalograms Acquired with Simulated Patient Head Movements

AU - Svystun, Olesya

AU - Schropp, Lars

AU - Wenzel, Ann

AU - Spin-Neto, Rubens

PY - 2021/3

Y1 - 2021/3

N2 - AIM AND OBJECTIVE: This study assesses changes in the sella turcica area (STA) and location of the cephalometric point sella (S) on lateral cephalograms acquired by charge-coupled device (CCD)-based cephalostats with and without simulated patient head movements.MATERIALS AND METHODS: A real skull was placed on a robot, able to simulate four head movements (anteroposterior translation/lifting/nodding/lateral rotation) at three distances (0.75/1.5/3 mm) and two patterns (returning to 0.5 mm away from the start position/staying at maximum movement excursion). Two ProMax-2D cephalostats (Dimax-3, D-3 or Dimax-4, D-4), and an Orthophos-SL cephalostat (ORT) acquired cephalograms during the predetermined movements ("cases," 48 images/unit) and without movement ("controls," 24 images/unit). Three observers manually traced the contour of sella turcica and marked point sella using a computer mouse. STA was calculated in pixels2 by dedicated software based on the tracing. S was defined by its x and y coordinates recorded by the same software in pixels. Ten percent of the images were assessed twice. The difference between cases and controls (case minus control) for the STA and S (namely Diff-STA and Diff-S) was calculated and assessed through descriptive statistics.RESULTS: Inter- and intraobserver agreement ranged from moderate to good for STA and S. Diff-STA ranged from -42.5 to 12.9% (D-3), -15.3 to 9.6% (D-4), and -25.3 to 39.9% (ORT). Diff-S was represented up to 50% (D-3), 134% (D-4), and 103% (ORT) of the mean sella turcica diameter in control images.CONCLUSION: Simulated head movements caused significant distortion in lateral cephalograms acquired by CCD-based cephalostats, as seen from STA and S alterations, depending on the cephalostat.CLINICAL SIGNIFICANCE: Patient-related errors, including patient motion artifacts, are influential factors for the reliability of cephalometric tracing.

AB - AIM AND OBJECTIVE: This study assesses changes in the sella turcica area (STA) and location of the cephalometric point sella (S) on lateral cephalograms acquired by charge-coupled device (CCD)-based cephalostats with and without simulated patient head movements.MATERIALS AND METHODS: A real skull was placed on a robot, able to simulate four head movements (anteroposterior translation/lifting/nodding/lateral rotation) at three distances (0.75/1.5/3 mm) and two patterns (returning to 0.5 mm away from the start position/staying at maximum movement excursion). Two ProMax-2D cephalostats (Dimax-3, D-3 or Dimax-4, D-4), and an Orthophos-SL cephalostat (ORT) acquired cephalograms during the predetermined movements ("cases," 48 images/unit) and without movement ("controls," 24 images/unit). Three observers manually traced the contour of sella turcica and marked point sella using a computer mouse. STA was calculated in pixels2 by dedicated software based on the tracing. S was defined by its x and y coordinates recorded by the same software in pixels. Ten percent of the images were assessed twice. The difference between cases and controls (case minus control) for the STA and S (namely Diff-STA and Diff-S) was calculated and assessed through descriptive statistics.RESULTS: Inter- and intraobserver agreement ranged from moderate to good for STA and S. Diff-STA ranged from -42.5 to 12.9% (D-3), -15.3 to 9.6% (D-4), and -25.3 to 39.9% (ORT). Diff-S was represented up to 50% (D-3), 134% (D-4), and 103% (ORT) of the mean sella turcica diameter in control images.CONCLUSION: Simulated head movements caused significant distortion in lateral cephalograms acquired by CCD-based cephalostats, as seen from STA and S alterations, depending on the cephalostat.CLINICAL SIGNIFICANCE: Patient-related errors, including patient motion artifacts, are influential factors for the reliability of cephalometric tracing.

KW - Cephalometry

KW - Head Movements

KW - Humans

KW - Radiography

KW - Reproducibility of Results

KW - Sella Turcica/diagnostic imaging

UR - http://www.scopus.com/inward/record.url?scp=85107692945&partnerID=8YFLogxK

U2 - 10.5005/jp-journals-10024-3056

DO - 10.5005/jp-journals-10024-3056

M3 - Journal article

C2 - 34210916

SN - 1526-3711

VL - 22

SP - 207

EP - 214

JO - Journal of Contemporary Dental Practice

JF - Journal of Contemporary Dental Practice

IS - 3

ER -